If I could go back to the first question about income-splitting, there are two offsetting effects. If the person is making donations in order to minimize his tax payments, reducing the tax paid by the one would actually be creating a disincentive. On the other hand, real household after-tax income would increase, and as a consequence it would create more income that would be available for donations. My intuition is that the second one would win out.
On February 9th, 2012. See this statement in context.